Abbazia di Monte Oliveto Maggiore is a Benedictine monastery located in the province of Siena, Tuscany, Italy. The abbey was founded in 1313 by Bernardo Tolomei and a group of followers who sought to live according to the Rule of St. Benedict. The complex of the abbey is notable for its Renaissance architecture, art, and gardens.

The cloister of the abbey is one of the most beautiful in Italy, featuring a series of frescoes by Luca Signorelli depicting the life of St. Benedict. The frescoes also include scenes from the Book of Genesis and the Apocalypse, and are considered to be some of the finest examples of Renaissance art in Tuscany.

The church of the abbey is also noteworthy, with a stunning interior that includes works by artists such as Sodoma, Signorelli, and Giovanni Antonio Bazzi. The abbey is also home to a library that contains over 40,000 volumes, including many manuscripts and incunabula.

Outside the abbey, visitors can explore the beautiful gardens, which include an orchard, a vegetable garden, and a medicinal herb garden. The gardens also feature a large pond, where visitors can observe a variety of water birds and other wildlife.

Abbazia di Monte Oliveto Maggiore is a popular destination for tourists and pilgrims alike, and is recognized as one of the most important religious and cultural sites in Tuscany.